Can I water the whole garden with just sprinklers in the lawn?

If you set the sprinklers to cover the beds and lawns in one go, then yes you can water the whole garden. However the amount of water and the frequency of watering is different for lawns and beds. Flowerbeds require more water, more often than lawns for optimum growth. The lawns can be kept green with less water (and less than optimum growth so less cutting the grass) with about half the water needed for the beds. We recommend a separate zone with pop-up sprinklers for the lawn and another for the beds with micro sprinklers (or drip pipe) But to keep it simple and reduce costs just stick with pop-ups and 'make rain'.